APPARATUS HAVING PLANARIZED SUBSTRATE AND METHOD OF MANUFACTURING THE SAME

1 . A method of manufacturing an apparatus, the method comprising:

preparing a substrate;

forming a coating layer comprising polyamic acid co-polymer on the substrate to planarize the substrate; and,

forming a plurality of thin films on the coating layer.

2 . The method of claim 1 , wherein monomers of the polyamic acid co-polymer comprises monomers represented by the following formulae 1 and 2:

wherein R 1 represents carbon or tetracarboxylic dianhydride, R 2 represents C 1 -C 20 alkane or diamine, and R 3 represents C 1 -C 20 alkane or diol.

3 . The method of claim 2 , wherein the substrate comprises a front surface, a rear surface facing the front surface, and a side surface connecting the front surface to the rear surface, and

the forming of the coating layer comprises:

coating a coating material comprising compounds consisting of the monomers represented in formulae 1 and 2 on at least one of the front surface and the rear surface of the substrate and the side surface; and

curing the coating material.

4 . The method of claim 3 , wherein the coating material comprises about 7.5 wt % to about 9 wt % of polyesterpolyamic acid prepolymer, about 5 wt % to about 18 wt % of epoxy polymer, about 1 wt % to about 2 wt % of an epoxy curing agent, and about 0.1 wt % of a silane cross-linking agent.

5 . The method of claim 4 , wherein the coating material comprises methyl-3-methoxypropionate.

6 . The method of claim 4 , wherein the polyesterpolyamic acid prepolymer forms polyesterpolyamic acid co-polymer through a heating process.

7 . The method of claim 3 , wherein the coating material is cured at a temperature less than the glass transition temperature of the substrate.

8 . The method of claim 3 , wherein the coating material is cured at a temperature of about 180° C. or less.

9 . The method of claim 8 , wherein the coating material is cured for about 30 minutes to about three hours.

10 . The method of claim 3 , wherein the coating layer has a thickness equal to or greater than about 1.4 μm.

11 . The method of claim 1 , further comprising preparing a counter substrate to face the substrate and forming a liquid crystal layer between the substrate and the counter substrate.

12 . An apparatus, comprising:

a substrate comprising a plurality of pixels; and

a coating layer on the substrate, the coating layer comprising polyamic acid co-polymer.

13 . The apparatus of claim 12 , wherein monomers of the polyamic acid co-polymer are represented by the following formulae 1 and 2:

wherein R 1 represents carbon or tetracarboxylic dianhydride, R 2 represents C 1 -C 20 alkane or diamine, and R 3 represents C 1 -C 20 alkane or diol.

14 . The apparatus of claim 13 , wherein the coating layer comprises about 7.5 wt % to about 9 wt % of the polyamic acid co-polymer and the polyamic acid co-polymer is one of alternating co-polymer, periodic co-polymer, random co-polymer, and block co-polymer.

15 . The apparatus of claim 13 , wherein the coating layer has a thickness equal to or greater than about 1.4 μm.

16 . The apparatus of claim 13 , wherein the substrate comprises a fiber reinforced plastic substrate.

17 . The apparatus of claim 13 , further comprising a plurality of thin films formed on the coating layer.

18 . The apparatus of claim 13 , further comprising a counter substrate facing to the substrate and a liquid crystal layer formed between the substrate and the counter substrate.

19 . A method of manufacturing a display apparatus, the method comprising:

preparing a first substrate;

preparing a second substrate;

coating a coating material comprising polyamic acid co-polymer on at least one of the first and second substrates;

curing the coating material at a temperature of about 180° C. or less to form a coating layer planarizing the at least one of the first and second substrates;

forming a plurality of thin films on the coating layer; and

coupling the first substrate to the second substrate,

wherein the polyamic acid co-polymer comprises monomers represented by the following formulae 1 and 2:

wherein R 1 represents carbon or tetracarboxylic dianhydride, R 2 represents C 1 -C 20 alkane or diamine, and R 3 represents C 1 -C 20 alkane or diol.

20 . The method of claim 19 , wherein the coating material is cured for about 30 minutes to about three hours.